Because he's the smart one? I know that this is a nit-pick to end all nit-picks. But Donnie was my favorite growing up, he already has all that "science" crap on his head, now he's wearing glasses over his mask because apparently smart people need glasses? Can you get any lazier? Where's his pocket protector?
Clark Kent wears glasses when he doesn't even have to. Egon rocked glasses in Ghostbusters. Raimi's Peter Parker wore glasses. Bruce banner wore glasses while working in Avengers.
Who says Donatello won't get laser surgery or contacts for the next one?
According to one of the latest TV spots, he also wears a retainer. They really went all out with the nerd stereotypes. I'm surprised they didn't give him (like you said) a pocket protector and a bowtie.
Logan, buddy. It's me, Deadpool! I shot youuuuuu....
I'm not saying that other characters haven't worn glasses in other films. But as has been said, it's just so stereotypical, like he happens to be the one ninja turtle to mutate with bad eyesight out of the four? I really like the designs for the Leo, Mike, and Raf. Donnie just seems too busy, and I think the "nerd glasses" adds to this.
I respectfully disagree that people love stereotypes. Every movie may have them, but they don't need them. I personally think that the "Nerdy character wears glasses" stereotype grew tired in the 80's, and should be dead now.
I took them to be goggles, not glasses. When you're a smart person doing all kinds of work in the lab and in the shop, you need goggles. Plus, there is that newish geek chic thing where people wear glasses and stuff and there's nothing wrong with their eyes.
I mean, look at Big Bang Theory. They're totally fake geeks, like people who aren't actually geeks try to be like them! They're making a million dollars an episode. Each.
In the flashback scene when they're first learning martial arts. If you look closely, you'll see that Donnie is, in fact, wearing a button-up shirt with a pocket protector. A friend and I were playing a drinking game with this movie last night and I picked that up in my boozed-up haze. I went back and looked at it again, and lo and behold, a pocket protector. They really took it all the way with the nerd stereotypes to the point of absurdity.
Logan, buddy. It's me, Deadpool! I shot youuuuuu....
Those were tortoiseshell glasses. Tortoiseshell is a material made from both tortoises and turtles. It's either a cool design element, or a very macabre one.
Anyway, Donnie had glasses and he still got to be badass, so it's okay.
07/08/06... 786... the sentinel of Allah has arrived.
Apart from the cliché point of a smart guy wearing glasses, it's not logic this guy needs glasses, he is a 3 meters high turtle which apparently doesn't have genetic issues.
I don't know if this counts, but in the scene where Splinter tucks in the baby Turtles Donnie is seen rubbing his eyes. This could mean he had some eye trouble as far back as his infancy, I can't be sure.
07/08/06... 786... the sentinel of Allah has arrived.